Following is a description of the pin connections for a FastLynx 7-wire
serial cable.  The cable is a 4-headed cable with a 9-pin and 25-pin
female connector on both ends.  The cable is wired as follows:

    9 pin   25 pin          25 pin  9 pin
    -----   ------          ------  -----
    pin 5   pin 7   <---->  pin 7   pin 5   (Ground - Ground)

    pin 3   pin 2   <---->  pin 3   pin 2   (Transmit - Receive)
    pin 7   pin 4   <---->  pin 5   pin 8   (RTS - CTS)
    pin 6   pin 6   <---->  pin 20  pin 4   (DSR - DTR)

    pin 2   pin 3   <---->  pin 2   pin 3   (Receive - Transmit)
    pin 8   pin 5   <---->  pin 4   pin 7   (CTS - RTS)
    pin 4   pin 20  <---->  pin 6   pin 6   (DTR - DSR)

The ground wire is connected to the same pin on both ends.  The last
three wires are a reverse of the prior three.

